net: ena: PHC: Fix potential use-after-free in get_timestamp_CVE-2026-52971

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ena: PHC: Fix potential use-after-free in get_timestamp\n\nMove the phc->active check and resp pointer assignment to after\nacquiring the spinlock. Previously, phc->active was checked without\nholding the lock, and resp was cached from ena_dev->phc.virt_addr\nbefore the lock was acquired.\n\nIf ena_com_phc_destroy() runs between the lockless active check and\nthe lock acquisition, it sets active=false, releases the lock, frees\nthe DMA memory, and sets virt_addr=NULL. The get_timestamp path would\nthen read a NULL virt_addr and dereference it.\n\nWith both the active check and the pointer read under the lock,\ndestroy cannot free the memory while get_timestamp is using it.",
    "published": "2026-06-24T16:28:49.637Z",
    "modified": "2026-06-28T06:37:25.591Z",
    "type": "cve",
    "title": "net: ena: PHC: Fix potential use-after-free in get_timestamp",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98\nhttps://git.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97\nhttps://git.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376",
    "id": "CVE-2026-52971",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux e0ea34158ee8c4f7536cd781010339ff28c0d24c\nLinux Linux e0ea34158ee8c4f7536cd781010339ff28c0d24c\nLinux Linux e0ea34158ee8c4f7536cd781010339ff28c0d24c\nLinux Linux 6.17",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "e0ea34158ee8c4f7536cd781010339ff28c0d24c",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}